Sandvik Coromant presents additional applications for CoroThread 266

Another advance more is the specific quality of threaded GC1125 of Sandvik Coromant, introduced in the programme CoroThread 266, with properties improved as a greater resistance to wear and tear, which help to achieve greater accuracy of the profile of the thread with a longer duration of court.

In the tasks of turning of threads, the cause of a short duration of the tool, not homogeneous performance and unsatisfactory results is often slight displacement of the cutting edge during machining. In this sense, the success of CoroThread 266 is based on that removes the micro of the interchangeable insert for cutting.

There are several factors that make the turning of threads need more care than most of the other tasks of turning. For example, the way of the thread should emerge with a cutting edge with, more or less the same angles, radii and smooth surfaces, which means that the edge is sharp and vulnerable. In addition, a thread has a step that varies from fine to large to very large step forward speeds for the tool.

In summary, all this not precisely the basis ideal to get a reliable court and operation at high speed with a long life of the tool.

The chipping of the edge of the Court, especially in the radius of tip, is one of the main negative consequences of the displacement of the plates. CoroThread 266 solves this problem by offering a complete setting of the insert in your seat through the exclusive adapter iLock. iLock uses lanes and slots to form an extremely rigid connection capable of supporting shear forces, increase the length of the tool and reduce cycle times.

The beginning and the end of a pass in the turning of threads involve sudden variations in the magnitude and direction of shear forces. These two moments are the most sensitive of machining, very vulnerable to the risk of displacement of the Insert. The tip of the profile of the insert thread forms a lever with the screw, which forces the cutting edge to move slightly from its position and to deform the points of support in the seat of the tool. At the beginning and the end of the last in the turning of threads occur alternative axial forces. These forces act on the Insert from different directions, so that the Insert tends to move backward and forward.

CoroThread 266 is designed to meet requirements for stability much higher than those of conventional systems of plates subject. The support of the Insert plate is an essential element in the turning of threads, so it has been redesigned to provide a secure base in the tool. Thanks to the strong two surfaces in contact with the seat and the screw to the subject at your site from the side, support plate allows a firm and precise positioning of the insert of court. The adapter iLock takes the form of a lane that sticks out, above which is placed the corresponding insert. The screw clamping the Insert the subject on the lane and against one of the faces of contact in radial location, allowing a stable and accurate placement. The forces of cutting during machining absorbed through the lane, so there is no risk of damage to the seat at any point in support of the Insert. The iLock rail is perpendicular to the direction of advance.

In regard to the accuracy, the tolerance M insert guarantees an axial deviation of the position of Court of ±0, 05 mm (direction of progress), while to the insert of tolerance E. offers ±0, 01 mm.

The productivity of the turning of threads is largely related to the number of passes that need to make a tool for turning to cover the entire length of the thread of a screw. An excessive number of passes, with a depth of insufficient Court, causes excessive in the tool and, as a result, a rapid wear in incidence and plastic deformation wear and friction. Also the formation of chip is can be adversely affected by a reduced depth and thin and little controlled shavings can be generated. A smaller number of passes needs greater depth of cut, but implies an increased burden on the cutting edge. To optimize the number of passes, the time required for machining all the thread is smaller and improves the fogging of the cutting edge. A great depth of cut produces high court forces that increase the tendency of the Insert to move the seat, which highlights the importance of a good grip of the Insert relevance.

Given the vulnerability of the cutting edge in the turning of threads, the insert must be as tough and durable as possible, without being fragile and without risks of rupture of the cutting edge during machining. Modern machining implies a considerable heat generation at the cutting edge, which imposes the need that the tool is resistant to the plastic deformation of the cutting edge and that translates to rapid wear in incidence and a possible rupture.

The trend of the cutting edge to suffer plastic deformation is the biggest obstacle to increase efficiency through the cutting speed in the turning of threads.An inadequate quality of the Insert quickly reduces the ability of the phylum produce an acceptable screw and finally leads to the rupture. For this reason, the CoroThread 266 chips are now offered in universal quality GC1125, which presents a greater resistance to plastic deformation and is provided with a more wear-resistant coating. These chips work at temperatures higher without losing its way, important factor when she is machining threads at high cutting speeds or when threads are long. In turn, can improve productivity by increasing the data of court, without prejudice to the length of the tool.

The coating by PVD is a new type of coating multilayered Tiain, designed to adapt to the rounded and the insert geometry, giving a great security to the cutting edge. Comparative tests with the competition underline the benefits of CoroThread 266. The machining of a thread metric 60 ° with a passage of 1.5 mm steel of low alloy 02.1 (150HB) took place in only five in a component of 25 millimetres in diameter on a length of 25 mm, compared with six past the competition system. However, even more important is the fact that it generated 374 threads with only 170 for the competing product (120 meters per minute cutting speed).